EP3382436B1 - Ghost reducing device, imaging device including same, ghost reducing method, and imaging optical system - Google Patents

Ghost reducing device, imaging device including same, ghost reducing method, and imaging optical system Download PDF

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Publication number
EP3382436B1
EP3382436B1 EP16868613.7A EP16868613A EP3382436B1 EP 3382436 B1 EP3382436 B1 EP 3382436B1 EP 16868613 A EP16868613 A EP 16868613A EP 3382436 B1 EP3382436 B1 EP 3382436B1
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EP
European Patent Office
Prior art keywords
optical system
imaging
light
imaging optical
douser
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP16868613.7A
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German (de)
English (en)
French (fr)
Other versions
EP3382436A4 (en
EP3382436A1 (en
Inventor
Koutarou Takigami
Yasuhiro Sawada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kamuy Innovation Corp
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Kamuy Innovation Corp
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Publication date
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Publication of EP3382436A1 publication Critical patent/EP3382436A1/en
Publication of EP3382436A4 publication Critical patent/EP3382436A4/en
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Publication of EP3382436B1 publication Critical patent/EP3382436B1/en
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B11/00—Filters or other obturators specially adapted for photographic purposes
    • G03B11/04—Hoods or caps for eliminating unwanted light from lenses, viewfinders or focusing aids
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/02—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the intensity of light
    • G02B26/023—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the intensity of light comprising movable attenuating elements, e.g. neutral density filters
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/0018—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 with means for preventing ghost images
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/003—Light absorbing elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/005—Diaphragms
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B11/00—Filters or other obturators specially adapted for photographic purposes
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B11/00—Filters or other obturators specially adapted for photographic purposes
    • G03B11/04—Hoods or caps for eliminating unwanted light from lenses, viewfinders or focusing aids
    • G03B11/045—Lens hoods or shields
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B5/00—Adjustment of optical system relative to image or object surface other than for focusing
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B9/00—Exposure-making shutters; Diaphragms
    • G03B9/02—Diaphragms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B2205/00—Adjustment of optical system relative to image or object surface other than for focusing
    • G03B2205/0053—Driving means for the movement of one or more optical element
    • G03B2205/0069—Driving means for the movement of one or more optical element using electromagnetic actuators, e.g. voice coils

Definitions

  • This invention relates to a ghost reducing device and an imaging device provided with it, a ghost reducing method, and an imaging optical system that can reduce ghosts caused by high-luminance subjects such as the sun.
  • Japanese Unexamined Patent Application No. H10-62669 is a technology to reduce ghosts by changing the operating size of an aperture according to the effective luminous flux that changes based on an aperture value (Patent Document 1).
  • Patent Document 2 proposes a technology to reduce harmful light by restricting a diaphragm within an aperture value that is smaller than its open value.
  • Patent Document 2 proposes JP 3 610989 , US 2002/126264 , US 2015/168712 , US 2014/320686 and WO 2015/098242 disclose conventional ghost reducing devices and/or aperture stops.
  • This invention has been made in order to solve such drawbacks as these, and its objective is to offer a ghost reducing device and an imaging device provided with it, a ghost reducing method, and an imaging optical system that can effectively reduce ghosts while having a simple and inexpensive configuration.
  • This invention can effectively reduce ghosts in spite of having a simple and inexpensive configuration.
  • Fig. 1 is a diagram showing an imaging device 10 provided with an imaging optical system 2 containing a ghost reducing device 1A of an illustrative example not being part of the invention.
  • the imaging device 10 of this example is mainly configured of the imaging optical system 2 for imaging a subject, and an imaging element 3 disposed in the focal position of this imaging optical system 2. Then, by disposing the ghost reducing device 1A in the vicinity of the pupil position of the imaging optical system 2, return light reflected by the surface of the imaging element 3 is blocked, reducing ghosts.
  • their configurations are explained.
  • the imaging optical system 2 forms an image of light from a subject onto the imaging element 3 through a lens.
  • the imaging optical system 2 has a front lens group 21 disposed in the front of the pupil position, a diaphragm 22 disposed in the pupil position, the ghost reducing device 1A disposed in the immediate rear of the pupil position, and a rear lens group 23 disposed in the rear of the pupil position.
  • the front lens group 21 and the rear lens group 23 are each configured of at least one lens and form an image of light from a subject onto the imaging element 3. Note that although the imaging optical system 2 has the front lens group 21 and the rear lens group 23 in this example, this is not limited to this configuration but can effectively apply to the imaging optical system 2 having at least the front lens group 21.
  • the diaphragm 22 is disposed in the pupil position of the imaging optical system 2 for adjusting the amount of passing light.
  • the diaphragm 22 is configured of an iris diaphragm that can increase or decrease the size of an aperture without changing the center position of the aperture. Note that although the imaging optical system 2 having the diaphragm 22 is used in this example, it is not limited to this configuration but is also applicable to the imaging optical system 2 having no diaphragm 22.
  • the ghost reducing device 1A is for blocking return light from the imaging element 3 and reducing ghosts.
  • the ghost reducing device 1A is configured of a douser 11 made of a black material having low reflectance.
  • the douser 11 has an opening 11a that is formed in a semicircular shape with approximately the same diameter as the aperture of the diaphragm 22 and lets light pass through.
  • Fig. 4 it is installed in the immediate rear of the diaphragm 22 so that the center of the opening 11a coincides with the optical axis.
  • the douser 11 has the opening 11 a disposed on only one side of a line perpendicular to the optical axis to let light pass through and block light on the other side.
  • the ghost reducing device 1A is disposed in the immediate rear of the diaphragm 22 because the diaphragm 22 is installed in the pupil position, this is not limited to this configuration.
  • the ghost reducing device 1A can be disposed in the pupil position of the imaging optical system 2.
  • the vicinity of the pupil position in this invention is a concept that is not limited to the pupil position but includes any position, such as the immediate rear of the pupil position, that is close to the pupil position within a range where the ghost reduction effect of this invention can be performed without generating vignetting.
  • the imaging element 3 is configured of a CCD (Charge-Coupled Device) image sensor or the like, photoelectrically converts brightness degrees of portions of an image formed on a light-receiving surface into the amounts of charge, and sequentially reads and converts them into electric signals. Note that although the imaging optical system 2 has the imaging element 3 in this example, is not limited to this configuration but is also applicable to an imaging optical system having no imaging element 3, such as a film camera.
  • CCD Charge-Coupled Device
  • the douser 11 as the ghost reducing device 1A is disposed in the vicinity of the pupil position of the imaging optical system 2. Because this douser 11 is simply a black plate, it has an extremely simple configuration and is inexpensive.
  • the ghost reducing device 1A in the vicinity of the pupil position restricts an incident luminous flux to light passing through the opening 11a formed on the upper half of a line perpendicular to the optical axis.
  • the area of the opening 11a is the maximum under the condition that the symmetrical position of the opening 11a with respect to the optical axis is totally blocked, a sufficient amount of light can be secured.
  • the ghost reducing device 1A of this example effectively suppresses such a phenomenon as shown in Fig. 11 that return light reaches the front lens group 21 and is reflected again by the front group lens 21, generating a ghost image on the surface of the imaging element 3.
  • the probability that return light is reflected before reaching the douser 11 and returns to the imaging element 3 becomes high, therefore the number of removed ghosts is relatively small.
  • the front lens group 21 has many lenses, many ghosts (return light) that are targets of removal are generated, therefore the effect of the douser 11 that can block them is extremely great.
  • the douser 11 has one semicircular opening 11a on only one side relative to a line perpendicular to the optical axis, it is not limited to this configuration. That is, the douser 11 only needs to have at least one opening 11a that lets light pass through and block light totally in the symmetrical positon to the opening 11a with respect to the optical axis of the imaging optical system 2.
  • three openings 11a each of which is formed in an arc shape with a central angle of 60 degrees, can be installed with 60-degree intervals around the optical axis.
  • the douser 11 having multiple openings 11a on not only one side but also both sides of a line perpendicular to the optical axis, light is totally blocked in the symmetrical positions of the openings 11a with respect to the optical axis of the imaging optical system 2.
  • an opening 11a that resembles one half of the yin-yang symbol can be formed on the douser 11. In this manner, even if the douser 11 has one opening 11a across both sides of a line perpendicular to the optical axis, light is totally blocked in the symmetrical position to the opening 11a with respect to the optical axis of the imaging optical system 2.
  • the douser 11 can have one opening 11a formed in a circular shape centering on a position off the optical axis.
  • a natural blurred image in a circular shape can be obtained.
  • a characteristic of this embodiment is that a ghost reducing device 1B is let function only when a high-luminance subject such as the sun enters its photographing field.
  • the ghost reducing device 1B of this embodiment has an advance/retreat drive means 12 that lets the douser 11 advance or retreat relative to the imaging optical system 2, a light detection means 13 that detects the intensity of light, and a control means 14 that controls the advance/retreat drive means 12 based on the detection result of this light detection means 13.
  • the advance/retreat drive means 12 lets the douser 11 advance or retreat relative to the imaging optical system 2.
  • the advance/retreat drive means 12 is configured of a solenoid actuator that lets the douser 11 move sliding along a direction perpendicular to the optical axis.
  • it can be any mechanism that can let the douser 11 advance or retreat relative to the imaging optical system 2.
  • the control means 14 is configured of a CPU (Central Processing Unit) etc. and controls the advance/retreat drive means 12 based on the detection result of the light detection means 13. In this embodiment, if the intensity of light is no lower than a prescribed threshold value, the control means 14 disposes the douser 11 advanced toward the imaging optical system 2. On the other hand, if the intensity of light is lower than the prescribed threshold value, the control means 14 controls the advance/retreat means 12 so as to let the douser 11 retreat from the imaging optical system 2.
  • a CPU Central Processing Unit
  • the intensity of light that makes ghosts easy to occur is obtained in advance, and that intensity of light is set as the above-mentioned threshold value.
  • the douser 11 can automatically retreat to secure a sufficient amount of light.
  • a vehicle-mounted camera as the imaging device 10 was installed facing the front in the vicinity of the upper end of the windshield.
  • light from the sun that is a high-luminance subject would enter depending on time of the day and the orientation of the automobile.
  • the ghost reducing device 1A restricted the incident luminous flux of sunlight entering the imaging optical system 2 to only light that passes through the opening 11a of the douser 11. Also, the douser 11 blocked return light that was reflected by the surface of the imaging element 3 and returned to the vicinity of the pupil position. Therefore, even when the sun was within the photographing field, ghost occurrences were effectively suppressed in images of the vehicle-mounted camera.
  • Example 1 it has been demonstrated that even in a vehicle-mounted camera that is demanded to photograph a certain region constantly, ghosts can be effectively reduced, and easy-to-see images can be offered.
  • imaging optical system and imaging device of this invention are not limited to the above-mentioned embodiment but can be changed as appropriate, the scope of the invention being defined by the appended claims.
  • the imaging device 10 of this invention is applied to a digital video camera
  • the imaging optical system 2 of this invention is applied to an imaging optical system built in the digital video camera.
  • the scope of application of this invention is not limited to the above, but this invention can be widely applied to imaging optical systems built in various kinds of cameras such as digital still cameras, film cameras, and cameras built in smartphones and tablets, and imaging devices provided with these imaging optical systems.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Studio Devices (AREA)
  • Lens Barrels (AREA)
  • Blocking Light For Cameras (AREA)
EP16868613.7A 2015-11-24 2016-11-24 Ghost reducing device, imaging device including same, ghost reducing method, and imaging optical system Active EP3382436B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015228966A JP6685040B2 (ja) 2015-11-24 2015-11-24 ゴースト低減装置およびこれを備えた撮像装置、ゴースト低減方法、ならびに撮像光学系
PCT/JP2016/084771 WO2017090670A1 (ja) 2015-11-24 2016-11-24 ゴースト低減装置およびこれを備えた撮像装置、ゴースト低減方法、ならびに撮像光学系

Publications (3)

Publication Number Publication Date
EP3382436A1 EP3382436A1 (en) 2018-10-03
EP3382436A4 EP3382436A4 (en) 2019-08-07
EP3382436B1 true EP3382436B1 (en) 2021-04-21

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US (1) US10845674B2 (ja)
EP (1) EP3382436B1 (ja)
JP (1) JP6685040B2 (ja)
KR (2) KR102260920B1 (ja)
CN (1) CN108292023B (ja)
HK (1) HK1256826A1 (ja)
IL (1) IL259438B (ja)
WO (1) WO2017090670A1 (ja)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6685041B2 (ja) * 2015-12-24 2020-04-22 カムイ・イノベーション株式会社 ゴースト低減装置およびこれを備えた撮像装置、ゴースト低減方法、ならびに撮像光学系

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WO2015098242A1 (ja) * 2013-12-27 2015-07-02 オリンパス株式会社 標本観察装置および標本観察方法

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WO2015098242A1 (ja) * 2013-12-27 2015-07-02 オリンパス株式会社 標本観察装置および標本観察方法

Also Published As

Publication number Publication date
IL259438A (en) 2018-07-31
US20180356708A1 (en) 2018-12-13
WO2017090670A1 (ja) 2017-06-01
CN108292023A (zh) 2018-07-17
KR20180085776A (ko) 2018-07-27
CN108292023B (zh) 2021-06-01
JP6685040B2 (ja) 2020-04-22
HK1256826A1 (zh) 2019-10-04
IL259438B (en) 2020-04-30
EP3382436A4 (en) 2019-08-07
JP2017097164A (ja) 2017-06-01
KR20200108509A (ko) 2020-09-18
US10845674B2 (en) 2020-11-24
KR102260920B1 (ko) 2021-06-03
EP3382436A1 (en) 2018-10-03

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